Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 22e5fd7254ba4b39…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a57fffb3df17c424d2f6ebdd4d8942c7 SHA-1: 962a7cef56a826ba1966487d88a65f6a301e9fb3 SHA-256: 22e5fd7254ba4b39130a474d0362637df10a0d7254245e40f757d8897f43164e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a large VBA macro suggest the execution of obfuscated code. The primary function of the VBA script appears to be decoding and executing a PowerShell command, which is a common technique for downloading and running additional malicious payloads.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
5c4ca6288f1046bd1296bd1bfe6309a89b25094fadbb1120572a10ea49363b72		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
7be7e88693b85068483873b1dedd0bfc22254017f287b726ceb75e9d97a2d3f2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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